On the other hand, when the handshake communication protocol is successful and the security device 40 is an authorized device having the same (e.g., matching) SDC, the mechanical lock mechanism of the security device 40 may operate using power from the key 20, either power that had been previously transferred by the key and stored by the security device and/or by power transmitted by the key to the security device. In the embodiment of FIGS. 1A-9B, electrical contacts disposed on the security key 20 electrically couple with cooperating electrical contacts on the security device 40 to transfer power from the internal battery of the key to the security device. Power may be transferred directly to the mechanical lock mechanism, or alternatively, may be transferred to a power circuit disposed within the security device 40 that operates the mechanical lock mechanism of the security device and may be configured to store the power for subsequent operation of the lock mechanism. In the embodiment of FIGS. 1A-9B, the cabinet lock 40 is affixed to one of the pair of adjacent and overlapping sliding doors 102 of a conventional cabinet 100. The cabinet 100 typically contains various types of equipment 110. The doors 102 overlap medially between the ends of the cabinet 100 and the cabinet lock 40 is secured on an elongate locking arm 104 of a lock bracket 105 affixed to the inner door. In the illustrated example, the key 20 transfers power to an electric motor, such as a DC stepper motor, solenoid, or the like, that unlocks the lock mechanism of the cabinet lock 40 so that the cabinet lock can be removed from the arm 104 of the bracket 105 and the doors moved (e.g., slid) relative to one another to access the equipment 110 stored within the cabinet 100. As shown, the arm 104 of the bracket 105 is provided with one-way ratchet teeth 106 and the cabinet lock 40 is provided with a complimentary ratchet pawls (not shown) in a conventional manner so that the key 20 is not required to lock the cabinet lock 40 onto the inner door 102 of the cabinet 100. If desired, however, the cabinet lock 40 can be configured to require use of the key 20 to both unlock and lock the cabinet lock.